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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db3726c63b767ef12d4576b02a46875364dda8dbc1b1b8442e40ac5b9a6070c' 
  AND token = 'mSOmj0z5pixfyBJjpNbsC6+hAOV95CkHduu/j77fxeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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