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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c717e7d4f68101ec324e95ae5f82dddbd2c457ca06fb96504dea94123e62ad9' 
  AND token = 'BaXZ0YfEGS77Pep1009XPyWWT+3+wh1EdDuLglTfUeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}