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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e19d8298a07174c21522fa47390bc9027fc5c796d2c1c58d6e90885aefa9b7' 
  AND token = 'jjRwCw97rzF4xus+11DhpnIfPG666CNw+tM3dTkauqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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