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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6dcfb7aa11f1e20e1a125753912f75512b221a01d5026983457aff73239429' 
  AND token = '5cLekwiqLnSBGm2WRSqH/9LGJRt7+f8ToBskl/QxMtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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