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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4530269fbdb623a667c7ae9d09ce160a351adf3787cfc61efe0a83b5b987ac' 
  AND token = 'ZwHlVhVaJSPAHbMn0p/MoZ8Ns3uXC1s3QMaC19fLR7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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