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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ecd353d7f1bb9c3e5f690083565cac08d3984ac00146ee59cd26a1b0384842' 
  AND token = '5OLnM6gj2Sl0r6DFaQ9joiYpaDCuG35r3dCPoYzPUUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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