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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705dc85b3fff38cba7b4fabff63bbdc8ec15dfa3da1e7e18e0e4e2d8e2c9ab25' 
  AND token = 'dWYBKvOT/feyUo/kaiP/y8D27PhFjnBc/5lSCqRPy9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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