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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737d58a8431b2cccce3dc315b180a85521017a4b587486766aaeec752a9bb312' 
  AND token = 'rlFI28I2MD2Byc/0U7hG5/V8Z5QoduN5mU/3kdtixg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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