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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd086e2c32ba7850f011d5be3d194cb91397269f665b9c9886e7ef5aaa2f891e4' 
  AND token = 'Xn5B+rL1hJkiGIIw5MrSYUaBOkr4rl/iVFPDciTEXtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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