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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e4e99eb5b4d115ddcfb9ba6a2fa4b0cbb74a0abd380a92662969d7c539baf8' 
  AND token = 'VqjDn78QWGYs5R3HlLCIOcXtXMW3JJdllI+4eXNWrWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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