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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fe3f4509fe2f6316b4e46cb948a061079c33a132f1799b10bfcbb548c621c9' 
  AND token = 'zKJ2zSBww/o1w9QKTyTQysS7kjIode/be3wl7c7KxQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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