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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86f1e19e2419343ae130d63a69812fcdec642490107fef1ba4ea1232e467d55' 
  AND token = 'UgxJwrkKI0Un4dqZ+27+bs4nHu+ziJHinXEMq1svTCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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