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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881ff04fcb57599bc6403271a3d33c84fe70acd0dcd0db17b0ab3f840e8fcba1' 
  AND token = '4Eupx3QeGfSZa8U4zY9bxKHvSdc2pbwfmueY5YIgXpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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