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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87cc6e2c34801f6c438e2a89aed67b461d80dd493d01353b88c65efa68bd6dd8' 
  AND token = 'qWc6cp0CDPXxB2m0hU8Gue9SUKlmqkW91A0yeYG+1Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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