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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e57d51d3273f905e9be83e9138e16b9c594a69008e5a5bd0d2bd27c50bb62c' 
  AND token = 'NHN/AeR/Jn825hYsjtbisaNAJwq+ES5gfKfolWfUetw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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