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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42005f1a301c48034ba14f77af4a4cb321a0bd4ee36c0bbd56cf00f4bfcb3f5' 
  AND token = '06B3KlJ3Xukv4wI6PjJGJIctSOGbgUOObS9Ch1fk5kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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