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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439f4ea2fe4289c06ab8685f4a2272eba8e1d5bbb8fe36ca17d8987df69b5f7e' 
  AND token = 'yi/Nq+DGerp2grekI4rJJrGUjCmwaTBtjMZb41DUqZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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