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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfc6faab77b61e6c66e7e4ee4e86fa909871c7629fba6cddbacbe7b24c1891e' 
  AND token = 'DBKZCo0ufPaE4NDSZ/s4RBtEZyTTOOYcdJUAgHCMpEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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