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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931d911a40c68f614951c9c67674e989e2aaf59d3816c9ac44098dd63c880f47' 
  AND token = 'H4gr1y9vhGuu1EDY48UB1c/TRztShdQoQQJRqLjaDK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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