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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e873d43189455d8e8a2cffc5caa051e5200a63065b41a1f551e10a350e032798' 
  AND token = 'Sm9BHyAJhZO3u/WUZRGMDz1O/CWyCeBCE+sCoQMBKyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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