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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945c0aeec600b726f660eca92f322494eab20025dd919043b0b50390bc7dc63d' 
  AND token = 'DH3zqYU/7PVnVP5tKzKi4tN6VN8Tx4CYsnlbCCN0e9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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