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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f42780563dcfb7c1b6ecc8ea35452d3160d6400b731dce06f94bd4d9a4f817' 
  AND token = 'C74vpMGrLZbq1sy+iNtLTc4hsdyg2cYyMS8Ku8evrvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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