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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d6354f66b3c18c0547c644ad97584130ad13feb0f7ad9d40e8da4dffb50e06' 
  AND token = 'yQcgJCjy1IBbU+gDEvzjlN0/MeMSCX5lzF0hgPFOvhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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