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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e13e91b28b8a841a0478134f51466343cbd0e898baa58c24fece3a7b47d9250' 
  AND token = '8gV5gotp/Tr7OOpZ4s97TCQFBZskZ/8q+DOEMYludng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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