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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156e69f5e108481565337021a5c1a11119d0d547df40f02488f214766f3bc12c' 
  AND token = 'YD1luPO5Ls92eHhv8r3L0u2Qiw1dzwazcgRaJJAukKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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