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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e23f25e601e55e7e9a27c78015d4fdef5e767dc551255106fc48fde327b525c' 
  AND token = 'QRbobt6Fw1CSn4LHVfr3hzeSgBxXtYhZGYxNw1q49Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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