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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683c8339f6ca0b8ff4c198d4f268350a43cd6656ca28a0bcf99e85e0fa2e8464' 
  AND token = 'Ny+waq9KkQrB4/XFUgXgUlE1iqSMFQ3YNpn9sBSRLcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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