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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acae3194bbf0fd8c35c5e7b0f4f1810da3250633ad8cd250fdae715422321564' 
  AND token = '9TWTlVCxhAalwiomVysSd5hpSMJqih4m8FmrPESsWwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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