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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e27f41950db7c26178709419a8e3f2ca881306f284d75eb1864c0fff391736' 
  AND token = 'q6iIyw32wICWvCppfD8CGnIT9UFxdmxqTwdz5TyoHgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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