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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e30903937d1db010f10b9afe98ed5b4240a8664d512d5c40db0db6d3039e474' 
  AND token = 'k9MFYLCj3mEhqLS1ZNE1Ign15J5pVNotKn/c9KPook0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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