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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c7d8bfab547fa9f572346f3c6a22b1a3f73c334b09543d0bfec8b94cc26ce5' 
  AND token = 'Zq7I71uM6EG/KEN0m5mFSkhflOoXi1GzW0MxvgSc0h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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