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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae1019ff88a60d4f404c74b476a76b19a09f1b1ee1c03bc0880dd9e944ecf508' 
  AND token = 'RroEaqWKkk89DtzawZE8L7I4PwIZoLgsx13f7s+9J7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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