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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd676442fad52d7064ea50024e3471161e792f175545779c0804d60f1781885e' 
  AND token = 'iqnCszT7bF2lS4n+eKd2GRO5Uo9ZkLL7vhC9AoEm+Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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