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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d4bfc7c2ba7b67b5d2a90db456760847678e9ca7be4ffc058b6de82c875f86' 
  AND token = 'g8fkganmVvwvt/7+LxycAxZGLg4qohdkxpkuJ1ug0J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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