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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b09edbed1164ec3eb0704a18be42c20ea3ff3f8108cd1360d5115be97cf1350' 
  AND token = 'fVyobiNs5thUPLSyHIkhs5QlRMrp6fA5MA5MfO2rxIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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