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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b1732fa346aa97955058fbfac84f0211e8285a16ef134ccfd92b7ef8df3949' 
  AND token = 'mcZdoQM0mrs1Wvoq3mXGe2wvWVQgQ0a6iiSfzao3AZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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