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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abd5ffd014aaa6de0d1841e65c2fdae02c903db18ed734a8767064778fd1926' 
  AND token = 'do9KLCxBjDP4/Sm9VeN5aZjq9mF6i0WiBy+ZMKu92z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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