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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fba8dfb1450fc044fb2e1cd882242b1d35445244f4fd4675159d74c71d33b0' 
  AND token = 'AJnJVsOvwNTBoPsU4FNWjenor14oNJoC20I2l+CKn1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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