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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c178dc54d8f5e7dc9fb5c228333eec5d5cad2cc4da4d1ac4f6b29698f7061a1' 
  AND token = 'KtyypyYQEY6bL781NKWaWh3LEjTegsRrwa7TAHOBFx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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