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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '083363567e60b05eebd142dd946453cf4cc911014225c7237c442d1232c5dbf9' 
  AND token = 'gU2gEyVLhdUCxLSxBpTRMtusY2+od2Y92sTxT2Udu+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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