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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8992fec93e60e729d1de70c99e7e8d415977002777dc329d94a4b1f47e3d6f86' 
  AND token = 'HHkiQiQCuX7gwj8fA7ZMj+3qlTNhjDLxK1oUR0NmjL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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