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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd303a821d82e9a49a7013fc6783c6fce0d4646e34a6b05b0a86b5728a8eff0' 
  AND token = 'fDAiUJLgqbXOpfAMnZ1l/LmVX8qtTjcq/cUFJ5gQ7xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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