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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfe483fdf760d5e951014bc75c1504b1274a0a16769e39c9d2f0d6eac922473' 
  AND token = 'GI6bb10nmS9lpU/kaDWsU6m1YF5M3/tnOwFHtY5kpPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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