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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5bf9b20b1fe1fb3f725a6d3b504240b0caa5803b76efcc2b9077c90a38888b' 
  AND token = 'DTIKI7AL4ewa3vrZ/6iY3YHt1NUAAInaBLOfdH1e3nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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