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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0cea44a303f336961542afd3cfbb920b6c4bc394d7ca7799291eff6e7044f5b' 
  AND token = 'bcGFIOU/hNFAFF3vo/+GL6ZvJ1uc0RpGus9BNScFmcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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