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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0da41bfa53a7ff37b0dda3f0a1a352e7f507e8ba9b8dae1375f12c5717fd67' 
  AND token = 'Qvo3sDmt3gYJknXprqFQs669O4iP597Kx0Ve/LaPBcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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