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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a3c5302898af8e4ab9444915c1002547210a7886bd565911188847749d8a80' 
  AND token = 'h08RP8D1V3TP2Mc/6oUvC7lTQBiq0ywJ2xoCvk0i+Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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