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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2141c82a8d68f5e5cc3509dc732d3d17fdc93f80c884eef8d6af2a81a41484' 
  AND token = 'x9HTVJRgcVBv2mjDc5Rf+GV/3Ek32DyJx3pUtBhGxJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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