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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23469be3159eb96d1abc5f1b7df6ae63794a3007e0a46ef3384dc6f025f2396' 
  AND token = '5xEcNC987NbqH5uffNpjvBVil09vHl+BnnJhxB0iG9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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