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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07dee9f6689f59ba353920ebb25cdddbc329da9da452d4eca8878b90abd8697' 
  AND token = 'f5mgLPRJHIhyavBRQqXtbU30v/MylhNfnIqeCb5nbxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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