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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9cc6fdee49bcf063e4a30d69e3f3f73ffcc37fd58838c166c715445c908c7e' 
  AND token = 'nxl+drkl9nDYRsYxEEirH8CGCSgA6bvu+Az4buunGdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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