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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04eb26e4ba02aa83c3bd67789374a701402e069026bc861d378bae21f2192e57' 
  AND token = 'fA35xMt2cwp9M+uH0+Om2sH3O2gCuxinCt+LmpNCTCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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