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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a531d8a1621cda9092e8d8923f7adfde02900b2a0ac3609a60b16dd18062824c' 
  AND token = '0VUcQ0cl+uudz6biRZloW8398JuqXX65cBfvh3Vt+gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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