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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8436bb9833d7c70cfba2e9a66f05118a8194dbbc06ad98fa3bec9d8cc889d4bd' 
  AND token = 'cKOCGWdr2gPzqH1l6zfYs4wyEwnhLgF2bR4JhI4FOMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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