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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de1722d267145c8330d2fc36eba93e6734c76eab85c1d1ac14c86945bd454568' 
  AND token = 'nXcNgX176Y6UkY1gTb4opxR9Fmjrsz9KN0Ra1DlylUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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