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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828af046bf53c63bd4f0f135ab4869b76312227e66d475ea2bc980b1c2e8cf66' 
  AND token = 'ae8BiD396/sVGsVmXu50Jv2moeRFss4CejXi70nY2Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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