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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a580a9a3675296c82a63f86a254c91e11de66d55225976125bc991a02da7b1f1' 
  AND token = '/agtAGtBwVrMH3zlV55WzD/5PR3QG2AXbtJku9o2UqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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